Can the lomo RF3 process lens be reversed?

[peterkinchington]

Hi everyone, Arne and Dan,

I read that the lomo RF3 300mm f/10 process lens is a 6/4 double gauss type - does anybody have a diagram of that construction? Is it completely symmetrical? If so I can easily mount it in reverse on my new lens board for landscape work. I have done this with my schneider angulon 120mm f/6.8 with very good results.

Cheers Peter Kinchington - peterk.2ya.com (http://peterk.2ya.com)

[Dan Fromm]

Peter, you can ask the lens whether it performs differently mounted normally and reversed. You can also ask the cells whether they have the same focal lengths.

The 1971 Yakovlev catalog (see the list) shows a cross-section. More-or-less symmetrical, perhaps not perfectly.

[peterkinchington]

Dan does this mean the lens will perform the same mounted normally or reversed? I will give it a go if it is almost symmetrical.
Thanks Peter

[Dan Fromm]

It should, but you can test. Hang it in front of a DSLR or a film SLR.

[peterkinchington]

Will do.
Bye Peter

[Pere Casals]

I read that the lomo RF3 300mm f/10 process lens is a 6/4 double gauss type[/URL]

Here, page 27 bottom, there is information about your lens. http://www.arnecroell.com/eastern-bloc-new.pdf

It is described as "Apo-Planar type process lenses" , 35lp/mm in the center and the 18lp/mm in the corner, 497(1:1)mm circle.

https://en.wikipedia.org/wiki/Zeiss_Planar
https://en.wikipedia.org/wiki/Double-Gauss_lens

Zeiss Planar family started in 1896 as a D gauss derivative, I guess.

[peterkinchington]

Here, page 27 bottom, there is information about your lens. http://www.arnecroell.com/eastern-bloc-new.pdf

It is described as "Apo-Planar type process lenses" , 35lp/mm in the center and the 18lp/mm in the corner, 497(1:1)mm circle.

https://en.wikipedia.org/wiki/Zeiss_Planar
https://en.wikipedia.org/wiki/Double-Gauss_lens

Zeiss Planar family started in 1896 as a D gauss derivative, I guess.

Thanks Pere

[peterkinchington]

Photo of Treeferns in Mountain Ash Forest taken with reversed RF3. 15min@f/90 with fomapan 100.
178037

peterkinchington.com (http://peterk.2ya.com)